class Animal:
    def sleep(self):
        print("睡")

    def eat(self):
        print("吃")


class dog(Animal):
    def run(self):
        print("跑")


class fish(Animal):
    def swimming(self):
        print("游泳")


class erha(dog):
    def kawayi(self):
        print("萌萌哒")

class zangeo(dog):
    def yaoren(self):
        print("咬人")

class shark(fish):
    def chiren(self):
        print("吃人")

